Elevator control system



Feb. 6, 1923,

\lv. H. HARTMAN.

ELEVATOR CONTROL SYSTEM.

3 SHEETS-SHEET1- FILED SEPT. 13, I920.

INVENTOR M Mqwrr fin/ BY Wi WITNESS Z ATTORNEYS 3 SHEETS-SIHEET 2.

FILED SEPT. 13, 1920.

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ATTEM T @FFHQE.

WILLIAM H. HARTMAN, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO RANDALL CONTROL AND HYDROMETRIC CORPORATION, OF LOS ANGELES, CALIFORNIA, A

CORPORATION OF CALIFORNIA.

ELEVATOR CONTROL SYSTEM.

Application filed September 13,

To all whom it may concern Be it known that I, WILLIAM H. HART- MAN, a citizen of the United States, and a resident of Los Angeles, county of Los Angeles, and State of California, have invented a certain new and useful Elevator Control System, of which the following is a specification.

The invention relates to elevator control systems and particularly to means for controlling the relative movement of the car and shaft doors.

An object of the invention is to provide means carried by the car for opening and closing the elevator shaft doors.

Another object of the invention is to provide means for unlocking and opening an elevator shaft door only when the car is brought to rest at a floor.

A further object of the invention is to provide means. operative to prevent the car from being operated when a shaft door is open or unlocked.

'A further object of the invention is to greatly simplify and reduce the cost of elevator shaft door opening and control systems.

The invention possesses other advantageous features, some of which, With the foregoing, will he set forth at length in the following description, where I shall outline in full, that form of the invention which I have selected for illustration in the drawings accompanying and forming part of the present specificatiom In said drawings I have shown one specific form of my invention, but it is to be understood that I do not limit myself to such form, since, the invention, as expressed in the claims, may be embodied in a plurality of forms.

This invention relates particularly to elevator control systems employing power operated means for openingand closing the elevator shaft doors. The power operated means may comprise any suitable mechanism, and in the present instance I have=employed a. fluid pressure motor. Heretofore, as far as I am aware, it has been the practice to install a. fluid pressure operated motor at each floor of the elevator shaft, the motor being connected to the shaft door. In a shaft having twenty shaft doors, such system entails the installation of twenty fluid pressure motors in the shaft. In accordance 1920. Serial No. 409,753.

with my invention, I provide one fluid pressure motor only, which is arranged on the car, and this motor moves into cooperative position with respect to the shaft door and its lock as the car reaches a position opposite a shaft door. Substantially the entire control and operative mechanism for the door and lock is-carried by the car, thus greatl reducing the cost of installation. eferrlng to the accompanying drawin igure 1 is a vertical section through an elevator shaft showing two shaft doors and an elevator car, part of the car structure beting broken away to disclose the construclon.

Figure 2 is an elevation on a larger scale, of an elevator car with its associated mechanism.

-Figure 3 is a detail elevation of the door lock.

Figure 4 is an elevation of a mechanism arranged under the angles to Fig. 2.

Figure 5 is an elevation of the side of the Elevator car which lies adjacent the shaft oor.

In Fig. 1, I have shown an elevator shaft having two shaft doors 2, but it is to be understood that the invention is applicable to elevator shafts having two or more shaft doors. A shaft door is arranged at each floor and is mounted to roll or slide transversely on a trackwa building structure. provided with a lock 4 in the closed position, ported on the building of the door opening. The lock is enclosed in acase 5 and is provided with a pivoted latch 6, which engages the bolt 7 on the sliding door. The latch is swung to disengage the bolt by the lever '8 having an arm 9 projecting from the lock casing. When the latch is swung to disengage the bolt and the bolt is withdrawn, the latch is locked in such disengaged position by the levers 12 and 13, pivoted within the casing. The lever 12 is provided with a depression, which, when the latch is moved and the bolt iswithdrawn, engages a pin 14 on the latch, holding it depressed, and the lever 13 is similarly provided with a. depression which concurrently engages a pin 15 on the latch.

car floor taken at right 33, secured to the 4 When in engagement with the pins, the levers 12 and 13 lie in the path of thebolt, so that when the door is closed, the levers 12 and 13 are moved out of engagement with the latch, which then moves into engagement with the bolt. The latch is moved into engagement with the bolt by the lever 8, which is provided with a counterweight 16, for that purpose.

Means are provided for opening the circuit of the elevator car operating motor when the lock is opened and for closing the circuit when the lock is closed. Engaging the counterweighted lever 8 in dach lock of the shaft is a wire or cable 17 extending vertically in the shaft, and which is connected to a cross lever 18, preferably arranged at the top of the shaft. Connected to the opposite end of the lever 18 is a wire or cable 19 secured to the sliding contact 21 of the master switch 22 in the motor circuit. The wire 17 passes through apertured pins 23 in the lever 8 in the lock 4 and above each pin an abutment 24 is secured to the wire, so that the movement of any one lever 8, in a direction to unlock the door, will raise the wire 17, which is nor- ,mally held down by a counterweight 25,

: which is of sufficient mass to readily overbalance the counterweight 26' on the end of wire 19; By this construction, the opening of any shaft door lock will cause the master switch to be opened and to remain open as long as a door is unlocked, and the locking of, an open door, if no other door is open or unlocked, will closethe master switch.

Means are provided on the elevator car for opening the lock and opening and closing the door. In the present construction, each door is provided with a roller 27 extending into the shaft which is adapted to be en aged by a slotted, transversely movable s 0e 28 carried by the car. When desired, these two inter-engagingparts may be reversed and the shoe arranged on the door and the transversely movable roller arranged on the car. The shoe 28 is mounted for transverse movement on the car and is held normally in position to engage the roller on the door. The shoe is provided with a long vertical slot, flaring outward to wider openings at the top and bottom, so as to insure engagement of the roller in the slot as the car moves into position opposite a door. \Vith the roller in engagement with the shoe, transverse movement of the shoe produces a corresponding transverse movement of the door.

The shoe is moved transversely by suitable means, such as the pressure fluid operated motor 31, mounted on top of the elevator car. The motor may be of any suitable construction, such, for instance, as that shown in United States Patent No. 1,263,- 108, issued April 16, 1918, to H. C. Randall.

transverse movement of the shoe 47 The motor comprises a pair of opposed cylinders, in which are disposed pistons, be- I tween which is arranged a piston rod 32. which is connected to the shoe-moving lever 33, pivoted to the car frame. Admission of air under pressure into one cylinder, moves the lever 33 to open the door and admission of air into the other cylinder moves the lever to close the door. Air under pressure is conveyed to the car through the flexible conduit 34, which is connected to the pipe 35 on the car. Arranged in the pipe is a threeway valve 36, which is operated by the grip 37, disposed in the car in convenient position to be actuated by the operator. The grip is arranged on a lever 38, pivoted to the car frame and engaging, at its other end, thevertical rod 39, which is connected to the valve 36, through the lever 41 and the rod 42. Movement of the grip in a clirection to raise the rod 39, opens the valve 36 and permits air under pressure to flow through'the pipe 43 to the cylinder 44. The cylinder 44 is rovided with a piston which is attached to t e links 45, to which are pivoted levers 46, pivoted on their f1 ee ends to the shoe 47. The levers 46 are fulcrumed on the car frame and are so disposed that vertical movement of the piston prodi ipes he shoe 47 is inclined backwardly at the top and bottom and with the car at rest at a floor, the shoe lies adjacent the arm 9 projecting from the lock. When air is admitted to the cylinder 44, the shoe is moved out-, wardly against the arm 9, opening the lock.

The flow of air to the motor 31 is controlled by the valve 48 connected to the shoe 47 by the rod49, so that when the shoe is moved to unlock the door, the valve 48 admits air into the door opening cylinder of the motor, opening the door. When it is desired to close the door, the grip 37 is moved back to normal position, moving the valve 36 to a position cutting oil the air supply to the cylinder 44 and establishing communication between the cylinder and the atmosphere. The release of the air from cylinder 44 permits the piston therein to descend, withdrawing the shoe from contact with the arm 9, thus positioning the look so that the door may be subsequently latched and atthe same time operating the valve 48 to cause the motor 31 to close the door. Since the master switch is held open when the door is unlocked, the elevator car cannot be started until the door is closed and locked.

. circuit relatively movable wit 53-54. the space between the abutment-s normally lying directly under the floor 55 of the car. Slidably disposed under the floor is a bifurcated lock bar 56 adapted to enter theg space between the abutments when the rod 52 is in neutral position. The lock slide is suitably connected to the rod 39, by

- levers and links as shown, so that an upward movement of the rod 39 causes the bar 56 to slide into engagement withthe .rod 52 between the abutments, thus locking the rod and consequently the control lever against movement. The space between the abut ments must be positioned in alinement with the slide before the rod 39 may be moved vertically and, lever must be moved to neutral position, before the door unlocking and opening mechanism may be thrown into operation. What is claimed is: 1. In an elevator system, a door, a car relatively movable with respect to the door, a lock for the door, means for operating the door lock, and means for opening the door, said last named means being operated in response-to the operation of thelock.

2. In an elevator sylstem, a door, a car respect to the door, a lock for the door, a fluid pressure cylinder carried by the car for operating the lock, a fluid pressure cylinder carried by the car for opening the door, and a valve forcontrolling the last mentioned cylinder operated in response tothe operation of the first mentioned cylinder.

havin a plurality of doors, of a car in said 5 aft, a motor for moving said car, a for said motor, a switch in said circuit, means arranged at each door for locking the door in the closed position, means connecting all of said looks with said switch whereby the unlocking of any door opens the switch, means carried by the car for unlocking said doors and pressure fluid operated means carried by the car for moving said doors. a

4. The combination with an elevator shaft having a plurality of doors, of a car in said shaft, a motor for moving said car, a circuit for said motor, a switch in said circuit, means arranged at each door for lockingthe door in the closed position, means connecting all of said looks with said switch whereby the unlocking of any door opens the switch, means carried by the car for unlocking said doors, means for moving said doors and means operated by the movement of said unlocking means for throwing said door moving means into operation- 5. The combination with an elevator shaft having a plurality of doors, of a car in said shaft, a motor for moving said car, a circuit for said motor, a switch in said circuit, means arranged at each door for locking and means operative consequently, the control,

on the car pressure fluid motor for opening the doors, mounted on the car, and adapted to be the door in the closed position, means connecting all of said looks with said switch whereb the unlocking of any door opens the switch, 1neans carried by the car for unlocking said doors, a pressure fluid motor carried 'by the car for moving said doors by the movement of the unlocking means for throwing the pressure fluid motor into operation.

6. The combination with an elevator shaft having a plurality of doors, ofa car in said shaft, amotor for moving said car, a circuit for said motor, a switch in said circuit, means arranged at each door for locking the door in the closed position, means connecting all of said l0Cks with said switch whereby the unlocking of any door opens the switch, pressure fluid operated means on the car for unlocking said doors and a pressure 'fluid motor for opening the doors adapted to be thrown into operation by movement of said pressure fluid operated means.

7. The combination with an elevator shaft having a plurality of doors, of a car in said shaft, a motor for moving said car, a circuit for said motor, a switch in said circuit, means. arranged at each door for locking the door in the closed position, means connecting all of said looks with said switch whereby the unlocking of any door opens the switch, pressure fluid operated means for unlocking said doors and a thrown into operationby movement of said pressure fluid operated means.

v 8. The combination with an elevator shaft having a plurality of doors, of means arranged at each door for locking the door in the closed position, a car in said shaft, pneumatically operated means carried'by the car for unlocking said doors and meanscarried by the car for moving said doors.

9. The combination with an elevator shaft havin a plurality of doors, of means arrange at each door for locking the door in the closed position, a car in said shaft, pneumatically operated means carried by the car for unlocking said doors and pressure fluid operated means carried by the car for moving said doors.

10. The combination with an .elevator shaft having a plurality of doors, of means arranged at each door for locking the door in the'closed position, a car in said shaft, means carried by the car for unlocking said doors, means for moving said doors and means operated by the movement of said unlocking means for throwing said door a car in said shaft,

arranged at each door for locking the door in the closed position, a car in said shaft, pressure fluid operated means on the car for unlocking said doors and a pressure fluid motor for opening the doors adapted to be thrown into operation by movement of said pressure fluid operated means.

. 13. The combination with an elevator shaft having a plurality of doors, of means arranged at each door for locking the door in the closed position, a car in said shaft, pressure fluid operated means on the car for unlocking said doors and a pressurefluid motor for opening the doors, mounted on the car and adapted to be thrown into operation by movement of said pressure fluid operated means.

r 14. The combination with an elevator shaft, having a -plurality of doors, of means arranged at each door for locking the door in the closed position, a car in said shaft means carried by the car for actuating said lock, means for controlling said lock actuating means to actuate and release said lock, means for moving said doors and means operated by the release movement of the lock controlling means to actuate the door closing means.

In testimony whereof, I have hereunto set my hand.

WILLIAM H. HARTMAN. 

